How long does the tasks stay in BPM worklist under My Staff Tasks

Summary:

We would like to know how long does the tasks stay in BPM worklist under My Staff Tasks. We see many items sitting for more than 3 months. Is there any process to purge?

Content (please ensure you mask any confidential information):

We would like to know how long does the tasks stay in BPM worklist under My Staff Tasks. We see many items sitting for more than 3 months. Is there any process to purge?

Version (include the version you are using, if applicable):

We would like to know how long does the tasks stay in BPM worklist under My Staff Tasks. We see many items sitting for more than 3 months. Is there any process to purge?